This is my second R800 after the first after a few weeks only gave a weak light spot by itself and I had to exchange it. The new lights although weaker than the old one, but still. The manufacturing tolerances appear to be significant. The R800 touches his handschmeichlerisch, but is too small for a man's hand. If the pot-bellied body tired in the hand, the thumb rests on the LCD. So you have to bend the thumb hard to press buttons, which is inconvenient in the long run. In addition, the keys are slippery and have no fixed point haptic (ordinary depression as on earlier computer keyboards, knobs, etc.). The slight depression is hardly noticeable. I have the situation significantly improved by a bit of fabric adhesive tape on the laser button. Here designers were back at work that have produced good looks, but no ergonomics. The typical Flushed design, round, smooth and difficult to operate. Positives: very handy is the compartment for the USB transceiver. So he does not get lost. It is interesting that this review would not let the heading "Poor ergonomics" submit.